Cold, wintry conditions can provide a variety of pleasant outdoor experiences, but only if enjoyed safely. The Forest Preserve District of DuPage County reminds all outdoor adventurers to put safety first this season.

Most ice activities, including fishing and skating, require at least 4 inches of clear ice. Visitors should note when visiting DuPage County forest preserves that all ice-related activities are done at the visitors’ own risk. Rangers do not monitor ice conditions, which can vary greatly on the same body of water.

Wind, snow, rain, sunlight, water levels, underground springs and variations in temperature are just some of the factors that affect ice strength. When checking ice, look for these indicators of dangerous conditions:

• cracks, ridges or faults in the ice;

• differently colored ice, especially dark gray or black;

• open water in the center of an otherwise frozen lake;

• ice that looks rotten or porous;

• ice covered by snow, water or slush;

• objects in or protruding from the ice;

• running water or bubbles visible under the ice; or

• pressure cracks along the shore.

When engaging in any winter activity, people should always dress for the occasion.

Hypothermia and frostbite are serious dangers that can best be prevented by dressing in warm layers and staying dry. Wearing an outer layer will block wind and moisture, and an insulating inner layer can trap heat and wick away perspiration. Waterproof boots, thick socks, a hat, and gloves or mittens help to keep extremities warm.

Visitors should be sure to inform others of their plans and when they expect to return. In any outdoor emergency, preserve visitors should call 911. To reach Forest Preserve District of DuPage County Police, call (630) 933-7240.